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We report on high-angular resolution observations of a dense core in thecirrus cloud MCLD123.5+24.9 obtained with the PdB and the OVRO interferometers.Our maps show substructures down to the scale of the beam (~ 1000 AU). Thechosen molecules CS(2-1) and HC_3N(10-9) trace different regions in the core.This can be explained by time-dependent chemical evolution of the cloud andtherefore provides constraints on the timescales of the fragmentation and coreformation processes. Our data demonstrate that the chemical evolution plays thedecisive role in our attempt to interpret observational data of different gasdensity tracers.Comment: 4 pages, 2 figures, to appear in "Proceedings of the 4th  Cologne-Bonn-Zermatt-Symposium", ed. S. Pfalzner, C. Kramer, C. Straubmeier,  and A. Heithausen (Springer Verlag

High-Angular Resolution HC3N and CS Observations of the Dense Core in the Cirrus Cloud MCLD123.5+24.9